US6141562A - System and method relating to cordless communications - Google Patents

System and method relating to cordless communications Download PDF

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Publication number
US6141562A
US6141562A US08/948,522 US94852297A US6141562A US 6141562 A US6141562 A US 6141562A US 94852297 A US94852297 A US 94852297A US 6141562 A US6141562 A US 6141562A
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mobility
ptnx
exchanges
cordless
arrangement
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US08/948,522
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English (en)
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Dick Eriksson
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/16—WPBX [Wireless Private Branch Exchange]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/12—Mobility data transfer between location registers or mobility servers

Definitions

  • the present invention relates to an arrangement and a method for providing cordless mobility in a telecommunications system comprising a private network.
  • the invention also relates to an arrangement for providing cordless access to the services provided by an exchange also when a cordless phone is not within coverage of a radio exchange adjunct to the exchange.
  • Sure an exchange may e.g. relate to a private branch exchange, a centrex etc.
  • the invention further relates to a telecommunications system comprising a private network wherein cordless mobility is provided and wherein cordless access to services offered by e.g. a private branch exchange is provided.
  • a cordless portable telephone can access a private branch exchange and the services provided thereby in a way which is similar to that of a normal desk telephone using DTMF (Dual Tone Multiple Frequencies) signalling as long as the cordless phone is within the radio coverage of a radio exchange (radio switch) adjunct to the private branch exchange.
  • DTMF Dual Tone Multiple Frequencies
  • the cordless telephone is not within radio coverage of a radio exchange adjunct to the private branch exchange it can not be used and the user instead has to use for example a PSTN (Public Switched Telephone Network) phone, a cellular phone or a desk phone in the private network.
  • PSTN Public Switched Telephone Network
  • a system described in WO 94/16531 is illustrated an arrangement for establishing telephone links in a communications system by call transmission.
  • a connection is provided between a number of radio exchanges and mobility is provided between them.
  • a link thus is provided between the already existing private network and the links provided therein.
  • the private branch exchanges have to fulfil a number of requirements. Signalling between nodes independently of the private branch exchange will not be achieved and since existing private branch exchanges are used for providing the connections, the services offered will be limited and it will not be possible to get access to all the extension services existing in each of the nodes of the private network.
  • PBX private branch exchange
  • the invention is not limited to private branch exchanges, e.g. it also relates to centrex exchanges or e.g. more generally to Private Telecommunications Network Exchanges (PTNX).
  • a PTN nodal entity that provides automatic switching and call handling functions used for the provision of telecommunication services.
  • a nodal entity consists of one or more nodes.
  • the nodal entity, performing the functions outlined above, can be implemented by equipment located on the premises of the private network administrator or by equipment co-located with, or physically part of a public network.”
  • Two implementations of PTNX are:
  • PBX An implementation of a private telecommunications network exchange located on the premises of a private network administrator.
  • Centrex An implementation of a private telecommunications network exchange not located on the premises of a private network administrator. Consequently whenever referring to a PBX in the present application this is not for a limitative purpose but a PBX is here defined as also comprising other exchanges.
  • PBX is in this document also defined as meaning Private Automatic Branch Exchange PABX.
  • Mobility or mobility management comprises two basic services, namely roaming and hand-over.
  • Roaming is according to ETSI/RES 3 (European Telecommunications Standard Institute, Technical Committee RES 3) described as "The process whereby a portable part can initiate and receive calls on more than one fixed part".
  • a portable part here means a cordless phone and a fixed part means a base station and its associated radio exchange.
  • the location register information is essential for both incoming and outgoing calls to/from the user.
  • Hand-over is by ETSI/RES 3 described as "The process of switching a call in progress from one physical channel to another channel".
  • There are different types of hand-over namely intra-cell hand-over relating to a hand-over within a base station coverage and inter-cell handover meaning a hand-over between two different base stations which can be connected to the same or to different radio exchanges.
  • an object of the present invention to provide an arrangement through which the services provided by a private branch exchange can be accessed by a cordless user throughout a private network. Moreover it is an object of the present invention to provide an arrangement through which cordless coverage can be extended over a whole private network and through which given or specific phone services such as DTMF phone services of private branch exchanges can be maintained across the whole private network without any networking support from the private branch exchange or without imposing requirements on the private branch exchange itself.
  • mobility serving means particularly referred to as a mobility server is arranged between a private branch exchange and a number of radio exchanges interfacing the private branch exchange using the existing interface from the private branch exchange wherein the mobility serving means emulates a radio exchange in interworking with the private branch exchange.
  • the mobility server can interface one or more radio switches depending on the circumstances, e.g. depending on the radio coverage that is wanted and on the number of portable phones to be supported etc.
  • the mobility server thus provides mobility for cordless users between several radio exchanges (REX) without imposing any new requirements on the private branch exchange.
  • Mobility for cordless users between a number of private branch exchanges is achieved through arranging mobility servers between a number of private branch exchanges and the radio exchanges (REX) interfacing the particular private branch exchanges and creating an overlay network of mobility servers.
  • Another advantage with the invention is that an extension can replace for example a desk phone with the cordless phone and still keep the directory number, i.e. the numbering gets flexible and the same number can be used whether using e.g. a desk phone or a cordless phone etc.
  • a particular advantage with the invention is that the services provided by a private branch exchange are also available to a cordless user either within the site of a private branch exchange or within a network of sites of private branch exchanges.
  • FIG. 1 illustrates a mobility server arranged between a private branch exchange and a radio exchange
  • FIG. 2 illustrates a network of sites
  • FIG. 3 illustrates an overlay network formed by three mobility servers in the case when no private branch exchange network exists
  • FIG. 4 illustrates an overlay network formed by mobility servers when a PBX network exists which does not support ISDN (Integrated Services Digital Network) signalling or digital connections,
  • ISDN Integrated Services Digital Network
  • FIG. 5 illustrates signalling between mobility servers when a PBX network supports ISDN signalling or digital signalling
  • FIG. 6 illustrates an embodiment wherein a mobility server acts as a transit node
  • FIG. 7 illustrates an embodiment with a large network wherein a number of mobility servers are networked and some of the mobility servers act as transit nodes, and
  • FIG. 8 illustrates transparent access signalling between a cordless telephone and a private branch exchange.
  • FIG. 1 illustrates mobility serving means, as referred to above also denoted mobility server, MOBS which is arranged between a private branch exchange PBX and two radio exchanges REX 1 , REX 2 .
  • the mobility server interfaces two radio exchanges; it can also interface one REX or more than two REXes.
  • one or more REXes Interface a PBX.
  • the mobility server MOBS emulates a radio exchange.
  • the mobility server offers mobility for cordless users between REX 1 and REX 2 , and since the interface to the PBX remains unchanged the PBX does not have to meet any further requirements.
  • the mobility server interfaces the two radio exchanges REX 1 , REX 2 on the ISDN S 2 interface.
  • the S reference point is adopted in PBX systems as the access interface for extension lines.
  • the S 2 indicates a 2 Mbps primary rate interface (30B+D).
  • an S, interface indicates a 1.5 Mbps primary rate interface (23B+D) used mainly in the USA.
  • the primary rate interface and its D-channel control singalling allows for traffic concentration, i.e. more than 30 or 23 users can be allocated to one interface (S 2 or S, respectively).
  • a cordless user is provided with access to the PBX over an extension line. Therefore the cordless user will be represented in the PBX with a directory number, a class of service, a number of accessible features and a line status. Then both a desk telephone and a cordless telephone can use the same directory numbers from the same directory number series. Furthermore, the PBX will provide the same functions to a roaming cordless user as to a cordless user who is within radio coverage of a REX adjunct to the PBX in a manner known per se. In general it applies to all services provided by a PBX but here merely a few examples are given such as extension initiated services, for example enquiry and transfer, diversion services, busy line services for incoming calls such as call-back etc.
  • FIG. 1 relates to providing mobility for cordless users who are within radio coverage of radio switches REX 1 , REX 2 which are adjunct to one and the same PBX.
  • FIG. 2 a further embodiment will be illustrated wherein mobility for cordless users who are within radio coverage of radio exchanges adjunct to different private branch exchanges.
  • a number of private branch exchanges PBX1, PBX2, PBX3 interface the public switched telephone network PSTN or the Integrated Services Digital Network ISDN.
  • a mobility server MOBS1 is arranged between the PBX1 and a number of radio exchanges REX1 1 , REX1 2 .
  • a mobility server MOBS2 is arranged between a PBX2 and REX2 1 , REX2 2 and on site C a mobility server MOBS3 is arranged between a PBX3 and REX3 1 REX3 2 .
  • the mobility servers MOBS 1 , MOBS 2 , MOBS 3 interface each other to form an overlay network of mobility servers which provides cordless users with a network wide mobility.
  • sites as defined herein site A, site B, site C
  • site A, site B, site C may coincide or not with the "normal" sites of the PBXes.
  • the private branch exchanges are not so interconnected as to form a network.
  • sites A, B, C each comprising a PBX1, PBX2, PBX3 and a mobility server MOBS1, MOBS2, MOBS3 which interfaces a number of radio exchanges REX1 1 , REX1 2 ; REX2 1 , REX2 2 , REX2 3 ; REX3 1 , REX3 2 .
  • an overlay network is formed by the mobility servers through interconnecting them over an interface supporting ISDN signalling or digital connections.
  • the network is linked to the respective PBX.
  • User information (B-channels) and control signals (D-channel) are carried in the overlay network formed by the mobility servers.
  • FIG. 4 one embodiment is shown wherein a PBX network already exists.
  • the PBX network does not support ISDN signalling and it does also not support digital connections.
  • user information as well as control signals are carried in the overlay network formed by the mobility servers.
  • the same reference signs are used in this figure as in FIG. 3. If fixed modem connections are used for ISDN signalling, an analog PBX network can be used.
  • an ISON PBX network or a PBX network exists which supports digital connections. This means that this network, i.e. the PBX network, also can support signalling and traffic between the mobility servers.
  • the same reference signs denote the same features as in FIG. 3 and FIG. 4.
  • the PBX network provides semi-permanent connections on which the signalling between the mobility servers can be carried.
  • the "D-over-B concept" for ISDN signalling can be used.
  • the D-over-B concept means that the D-channel, which carries control signals, in set up over a B-channel end-to-end between two nodes in a network.
  • the B-channel is a bearer.
  • the network supports digital transmission and can be ISDN or just a switched PCM network. It can be a private or a public network.
  • Dynamic route allocation is a service specified by ETSI (European Telecommunication Standards Institute) which provides a semipermanent route between two nodes over a switched network. The number of B-channels in the route can be dynamically controlled by the two nodes in order to match the actual traffic load and thus reduce transmission costs.
  • ETSI European Telecommunication Standards Institute
  • FIGS. 6 and 7 concepts are illustrated which are based on the application of transit nodes.
  • a mobility server MOBS2 acts as a transit node between mobility server MOBS1 interfacing a PBX1 on site A and mobility server MOBS3 interfacing a PBX3 on a site C and thus there does not have to be interconnection between every mobility server.
  • FIG. 7 is a very schematical illustration of a network with large sites wherein each site requires a number of networked mobility servers.
  • site A a PBX-A is interfaced by two mobility servers and MOBS A1, MOBS A2 which in turn interface with a transit node MOBS XA.
  • MOBS XA a PBX-A is interfaced by two mobility servers and MOBS A1, MOBS A2 which in turn interface with a transit node MOBS XA.
  • the corresponding arrangement is relevant also to site B and the transit nodes formed by the mobility servers MOBS XA and MOBS XB are interfaced with each other.
  • transit nodes can as referred to above be used when the sites are large but it can for example also be used in large networks comprising many nodes. Of course it can also be used under any other circumstances when it is found appropriate.
  • the interwork between a PBX or in the shown embodiment PBX1, with the mobility server and MOBS1 can take place using any type of extension interface.
  • the extension interface may for example provide concentrated access e.g. via the ISDN S 2 interface or may provide multiplexed access over the PCM/CAS interface but it may also be an analogue line.
  • PCM Pulse Code Modulation
  • ITU formerly CCITT
  • CAS Common Channel Signalling
  • G.700-G.795 describe general aspects of digital transmission systems.
  • the interworking between REX1 and MOBS1 (and REX2 anad MOBS2) is effected via the ISDN S 2 interface supporting intelligent D-channel signalling e.g. for mobility management.
  • PBXes here REX1 and REX2
  • PBX1 forms a home-PBX for the portable 2525.
  • the overlay network of mobility servers MOBS1, MOBS2 uses in this embodiment ISDN Q-SIG private network signalling for mobility management.
  • the signalling provides transparent access signalling between portables and the private branch exchange.
  • Q-SIG is an ISDN network protocol set for private networks specified by ETSI.
  • ETSI standards apply to basic call and as a basis for supplementary services: ETS 300 170, "Data link layer protocol at the Q reference point for the signalling channel between two private telecommunication network exchanges", ETS 300 172, “Layer 3 protocol for signalling between exchanges of private telecommunication networks for control of circuit switched calls”, ETS 300 239, “Generic fuctional protocol for the support of supplementary services”.
  • the following draft ETSI standards apply to cordless mobility in private networks: QSIG-CTAU, "Cordless terminal authentication", QSIG-CTLR, “Cordless terminal location registration” QSIG-CTMI, "Incoming CTM call handling", QSIG-CTMO, "outgoing CTM call handling”.
  • Mobility management signalling between the mobility servers MOBS1 and MOBS2 is in an advantageous embodiment carried in ISDN Q-SIG facility information elements in agreement with standards proposed by ETSI/ECMA for private network cordless mobility.
  • ECMA relates to a standard body (formerly European Computer manufactures Association) standardizing information and communication systems, e.g. private telecommunications networks.)
  • DECT Digital European Cordless Telecommunications Standard; the standard e.g. specifies the radio interface between a cordless portable and a base station.
  • the standard is specified by the technical committee RES3 of ETSI.) standard may be applied.
  • a common database is used according to an advantageous embodiment.
  • This common database can be used for the entire overlay network and it may for example be in the form of an internal central database but it may also take the form of an internal distributed database.
  • the common database comprises a central external data base. The implementation of the data base can also be done in other ways and which implementation that is used for example depends on the size of the overlay network and the size of the extension profile etc.
  • DECT For ciphering the DECT standard may be used.
  • FIG. 8 What has been described in relation to FIG. 8 in general relates to mobility within a network (in the FIG. merely 2 are shown) of mobility servers.
  • the invention however also relates to providing mobility within one site but between different radio exchanges either as a standalone function but of course also within a network.
  • Handover between radio exchanges REX interfacing one and the same mobility server is supported by this mobility server.
  • the mobility server provides for transparent signalling between a radio exchange REX and a private branch exchange PBX wherein transparent signalling means that it appears that the REX and the PBX are directly interconnected without the intermediate mobility serving means.
  • This transparent link is set up both for intra-site calls and for inter-site calls. For inter-site calls, i.e.
  • a roaming cordless portable telephone gets a direct link to its home-PBX via the overlay network.
  • the mobility server emulates a REX in its interwork with the PBX.
  • All the extension features and services which are applicable to a DTMF extension will also be applicable to a cordless portable.
  • These extension features may for example relate to user procedures comprising digits 0-9, * and #, as well as the R-key.
  • the services are available both on one site and throughout the overlay network.
  • the key-pad procedures are carried in ISDN Q-SIG facility Information elements.
  • ECMA provides the unique object identifier. This makes the proprietary signalling information being handled as transparent information by any foreign network node supporting the generic procedures which are defined by ETSI and ECMA. Thereby a mixed network of switches can be allowed.
  • the invention as described in relation to the particular embodiments is of course not limited to the shown number of exchanges but a network may comprise any number thereof and take any form.
  • the invention is also not limited to the mentioned interfaces; other interfaces can also be used as well as the invention is not limited to the mentioned standards but it is applicable using other standards as well.
  • the examples of services provided is of course also not exclusive; a number of other services can also be provided and it is only a question of which services are provided by the private network or the private exchange.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
US08/948,522 1994-12-30 1997-10-10 System and method relating to cordless communications Expired - Lifetime US6141562A (en)

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US08/948,522 US6141562A (en) 1994-12-30 1997-10-10 System and method relating to cordless communications

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EP (1) EP0800750B1 (sv)
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